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<pre class="textdiagram" id="fig1">
 +------------+
 |            |
 |   Client   |
 |            |
 +------------+
 |    REQ     |
 \---+--------/
     |    ^
     |    |
"Hello"  "World"
     |    |
     v    |
 /--------+---\
 |    REP     |
 +------------+
 |            |
 |   Server   |
 |            |
 +------------+
</pre>
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